Constant Sequence in Topological Space Converges
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Theorem
Let $X$ be a topological space.
Let $x \in X$.
Define a sequence $\sequence {x_n}_{n \in \N}$ by:
- $x_n = x$ for each $n \in \N$.
Then $\sequence {x_n}_{n \in \N}$ converges to $x$.
Proof
Let $U$ be an open neighborhood of $x$.
Then we have $x_n = x \in U$ for all $n \in \N$.
Hence $\sequence {x_n}_{n \in \N}$ converges to $x$.
$\blacksquare$